Nopalea juice is made from the prickly pear fruit, which has high levels of antioxidants, carotenoids and fiber. An early study notes that prickly pear juice contains several different types of antioxidants, and regular intake of these antioxidants may reduce the risk of cancer and other diseases.
Prickly pear juice may minimize the effects of a hangover and lower blood sugar levels in individuals with type 2 diabetes, but more research is needed to verify these findings. Research has indicated that foods high in antioxidants likely decrease the risk of contracting diabetes, heart disease, eye disorders and Alzheimer's. Possible side effects of prickly pear juice include nausea, abdominal fullness and complications with bowel movements, including mild diarrhea and increased stool volume and frequency.